(icalendar--get-event-property): Doc fix.
(icalendar--get-event-property-attributes)
(icalendar--get-event-properties)
(icalendar--datetime-to-diary-date): New functions.
(icalendar--split-value): Doc fix.
(icalendar--datetime-to-noneuropean-date)
(icalendar--datetime-to-european-date): New optional argument
SEPARATOR. Return result as a string instead of a list.
(icalendar--get-weekday-number): Check if ABBREVWEEKDAY is nil.
(icalendar--convert-string-for-export): Rename arg S to STRING.
(icalendar-export-region): Doc fix. Change name of error buffer.
Save output buffer.
(icalendar-import-file): Add blank at end of prompt.
(icalendar-import-buffer): Doc fix. Do not switch to error
buffer. Indicate status in return value.
(icalendar--convert-ical-to-diary): Doc fix. Change name of error
buffer. Save output buffer. Handle exception from recurrence
rules (EXDATE, EXRULE). Handle start- and end-date of recurring
events. Fix problems with weekly all-day events.